Midrash for Numbers 5:20
וְאַ֗תְּ כִּ֥י שָׂטִ֛ית תַּ֥חַת אִישֵׁ֖ךְ וְכִ֣י נִטְמֵ֑את וַיִּתֵּ֨ן אִ֥ישׁ בָּךְ֙ אֶת־שְׁכָבְתּ֔וֹ מִֽבַּלְעֲדֵ֖י אִישֵֽׁךְ׃
but if thou hast gone aside, being under thy husband, and if thou be defiled, and some man have lain with thee besides thy husband—
Sifrei Bamidbar
(Bamidbar 5:20) "And you, if you have gone astray": This tells me only of the regular mode. Whence do I derive (that the same applies for) the irregular mode (i.e., anal intercourse)? From "and if you have become unclean." "and a man has put his lying in you": to include (in these strictures) one who is impotent, (where there is only "lying," but no seed.) "aside from your husband": to include the wife of one who is impotent. He stipulates all (contingencies) with her.
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